diff --git a/core/misc/form.js b/core/misc/form.js
index b1d1fff..c5e511e 100644
--- a/core/misc/form.js
+++ b/core/misc/form.js
@@ -10,6 +10,29 @@
     return (this[0] && callback) ? $.trim(callback(this[0])) : '';
   };
 
+/**** JS for checkbox ****/
+  $.fn.shiftClick = function () {
+  var lastSelected; // Firefox error: LastSelected is undefined
+  var checkBoxes = $(this);
+  this.each(function () {
+    $(this).click(function (ev) {
+      if (ev.shiftKey) {
+        var last = checkBoxes.index(lastSelected);
+        var first = checkBoxes.index(this);
+        var start = Math.min(first, last);
+        var end = Math.max(first, last);
+        var chk = lastSelected.checked;
+        for (var i = start; i <= end; i++) {
+        checkBoxes[i].checked = chk;
+        }
+      } else {
+          lastSelected = this;
+      }
+    })
+  });
+};
+$('.checkbox .form-checkbox').shiftClick();
+
   /**
    * Sets the summary for all matched elements.
    *